Leather-stitching machine.



B. H. THBISEN & G. S. KELLER. LEATHER STITGHING MACHINE. APPLICATION FILED MAR. 30, 1907.

Patented Apr. 23, 1912.

2 SHEETS-SHEET 1.

B. H. THEISEN &; G. S. KELLER.

LEATHER STITOHING MACHINE. APPLIOATION FILED 111,111.30, 1907.

1,024, 1 62. Patented Apr. 23, 1912.

2 BHEET8-SHEET 2.

COLUMBIA PLANbORAPH CO.,WASHINGTON.' D. c.

BRUNO H. THEISEN AND GEORGE S. KELLER, 0F MINNEAPOLIS, MINNESOTA.

LEATHER-STITGI-IING MACHINE.

Specification of Letters Patent.

Patented Apr. 23, 1912.

Application filed March 30, 1907. Serial No. 365,541.

To all whom it may concern:

Be it known that we, BRUNO H. TI-IEIsEN and GEORGE S. KELLER, of Minneapolis, Hennepin county, Minnesota, have invented certain new and useful Improvements in Leather-Stitching Machines, of which the following is a. specification.

The object of our invention is to provide a machine of simple economical construction having but few parts and easy of operation.

A further object is to provide a stitching machine capable of operation by foot or by power, as desired.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure 1 is a front elevation of the upper portion of the stitching machine, Fig. 2 is a side view, partially in section, Fig. 3 is a detail view of the awl and needle jaws, Fig. 4 is a similar view, illustrating the position assumed by the jaw during the operation of forming the stitch, Fig. 5 is a sectional view on the line XX of Fig. 3, Fig. 6 is a similar view illustrating the portion of the plate which engages the thread to move it into the path of the needle.

In the drawing, a suitable base has upright standards 3 and 4 supporting the operating mechanism of the machine (see Figs. 1 and 2). 5 is a crank shaft havin bearings 6 on said standards and extending beyond the said standards at each side and provided on one end with a fly wheel 7 having a peripheral groove 8 to receive a belt when the machine is operated by power. A treadle not shown 9 is pivoted on the base 2 and has a pitman rod 10 connecting it with the crank shaft 5. A cam 11 is secured on the crank shaft near the fly wheel 7. A second cam 12 is secured on the opposite end of the crank shaft. A shaft 13 is mounted in bearings in the upper ends of the standards 3 and 4 and a jaw let is secured on said shaft and adapted to rock therewith in a vertical plane, and a rod 15 connects said jaw with the crank shaft 5, whereby when the crank shaft is revolved, a rocking movement will be imparted to the jaw let for the purpose of operating the awl and the needle (Figs. 1 and 2). A secondary jaw 16 is provided on the under side of the jaw 14 and attached thereto by a bolt 17 which prevents independent vertical movement of the jaw 16, but allows it to oscillate laterally with respect to the jaw 14. A spring 18 (Fig. 5) normally tends to press the aw 16 away from the aw 14 and an adjustable screw 19 (Fig. 3) mounted in the jaw 14 fits within a socket in the jaw 16 and regulates the lateral movement of the said jaw 16 according to the length of stitch or the feed desired. The end of the screw is tapered and as it is moved into the socket the throw of the jaw 16 is shortened and as the tapered end of the screw is withdrawn from the socket the stroke of the jaw is lengthened. The jaw 16 has an upwardly curved horn 20 wherein the awl 21 is secured, being accessible through a removable plate 22 secured on the face of the jaw.

23 is a work plate having an opening 2 1 through which the awl operates.

By loosening bolt 17 the jaw 16 may be removed to permit examination or repair of the awl.

A needle 25 is mounted in the jaw 1 1 and accessible through a removable plate 26. This needle has a notch 27 to receive the thread and pull it up through the hole made by the awl, (Figs. 3 and 4). The jaw 1A is preferably secured to the shaft 13 by a clamping screw 28 (Fig. 1). By this means the jaw 14: may be adjusted on the shaft to obtain the desired range of movement.

Between the standards 3 and A is a post 29 (Fig. 2) having hearings in cross bars 30 and 31, consisting preferably, of adjustable pivot pins 32 and 32. This post is adapted to rotate partially on its bearings. A curved arm 33 is provided at the lower end of said post extending outwardly and downwardly therefrom and carrying a lever 34 .pivoted at 35 on said arm and having an anti-friction bearing wheel 36 at its lower end in the path of the cam 11 (Fig. 2). An adjusting screw 37 mounted on the arm 33 is adapted to engage the lever 34.- and move its free end toward or from the said arm to regulate the time of engagement of the cam with the wheel 36. Then the lever is engaged by the cam the post 29 will be rotated a predetermined distance according to the position of the lever 34 with respect to its supporting arm. At the which during a portion of its stroke is adapted to engage the jaw 16 and press it toward the jaw 14: against the tension of the spring 18, the said jaw 16 swinging on its pivot 17 as heretofore described.

For the purpose of holding the material securely on the work plate 23 we provide a presser foot 23. The hand of the presser foot is directly above the work plate in position to engage and hold the leather securely thereon.

lVe claim as our invention:

1. The combination, with an oscillating needle jaw having a needle, of a pivoted awl jaw carried by said needle jaw and provided with an awl, said awl jaw having a lateral movement independently of said needle aw, a spring device for normally holding said awl jaw at the limit of its lateral movement, an oscillating post having an arm arranged to engage said awl jaw at a predetermined point in its movement, a second arm provided on said post, and a cam device arranged to actuate said second arm and rock said post and said first named arm.

2. In a stitching machine, the combination, with a frame, of a post mounted therein, an arm mounted on said post, a lever carried by said arm, means for adjusting said lever toward or from said arm, a cam arranged to engage said lever and actuate said arm and post, a second arm provided on said post, a needle jaw and means for oscillating the same, a needle carried by said jaw, an awl jaw pivoted on said needle jaw and having an awl and adapted to swing on its pivot laterally with respect to said needle jaw and said awl jaw being in the path of the second arm on said post to be actuated thereby at predetermined intervals. 3. In a stitching machine, the combination, with a frame, of a post mounted therein, an arm thereon, a lever carried by said arm and capable of adjustment toward or from the same, a cam arranged to engage said lever to actuate said arm and post, needle jaw and a needle, an awl jaw pivoted on said needle jaw and having an awl and capable of movement sidewise with respect to said needle jaw.

1. In a stitching machine, the combination, with a frame, of a post mounted therein and having a projecting arm thereon, a lever pivoted on. said arm, a revolving cam, means for adjusting said lever toward or from said cam to hasten or retard the time of engagement of said cam with said lever, a needle jaw and needle, an awl jaw pivoted on said needle jaw and having an awl, said post having means arranged to engage and oscillate said awl jaw when said post is rocked by the movement of said cam.

5. The combination, with a frame, of an oscillating needle jaw and needle, an awl jaw pivoted on said needle jaw and capable of movement toward and from the same, means yieldingly holding said awl jaw out of the plane of said needle jaw, an awl carried by said awl jaw, means for oscillating said jaws to punch a hole in the material, means for oscillating said awl jaw inde pendently of said needle jaw to feed the goods, and a screw mounted in said needle jaw and fitting loosely into a socket provided in said awl jaw.

In witness whereof, we have hereunto set our hands this 25th day of March 1907 BRUNO H. THEISEN. GEORGE S. KELLER. Witnesses:

RICHARD PAUL, J. B. ERA.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

